Spatiotemporal Regulation of Lateral Root Organogenesis in Arabidopsis by Cytokinin

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Středoevropský technologický institut. Oficiální stránka publikace je na webu muni.cz.
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BIELACH Agnieszka PODLESAKOVA K. MARHAVÝ P. DUCLERCQ J. CUESTA C. MUELLER B. GRUNEWALD W. TARKOWSKI Petr FRIMLOVÁ Eva

Rok publikování 2012
Druh Článek v odborném periodiku
Časopis / Zdroj Plant Cell
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
www http://www.plantcell.org/content/24/10/3967.full.pdf+html
Doi http://dx.doi.org/10.1105/tpc.112.103044
Obor Biochemie
Klíčová slova DEPENDENT AUXIN GRADIENTS; GENE-EXPRESSION; FOUNDER CELLS; DEVELOPMENTAL WINDOW; MASS-SPECTROMETRY; PLANT DEVELOPMENT; INITIATION; MERISTEM; TRANSPORT; THALIANA
Přiložené soubory
Popis The architecture of a plant's root system, established postembryonically, results from both coordinated root growth and lateral root branching. The plant hormones auxin and cytokinin are central endogenous signaling molecules that regulate lateral root organogenesis positively and negatively, respectively. Tight control and mutual balance of their antagonistic activities are particularly important during the early phases of lateral root organogenesis to ensure continuous lateral root initiation (LRI) and proper development of lateral root primordia (LRP). Here, we show that the early phases of lateral root organogenesis, including priming and initiation, take place in root zones with a repressed cytokinin response. Accordingly, ectopic overproduction of cytokinin in the root basal meristem most efficiently inhibits LRI. Enhanced cytokinin responses in pericycle cells between existing LRP might restrict LRI near existing LRP and, when compromised, ectopic LRI occurs. Furthermore, our results demonstrate that young LRP are more sensitive to perturbations in the cytokinin activity than are developmentally more advanced primordia. We hypothesize that the effect of cytokinin on the development of primordia possibly depends on the robustness and stability of the auxin gradient.
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